Apex domains cannot have CNAME records.
Question and response
Question
dig infocoop.go.cr. NS
Answer
infocoop.go.cr. 5 NS denver.ns.cloudflare.com.
infocoop.go.cr. 5 NS jillian.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0